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Buck 591 Paradigm Shift S35VN Black G10 Bolster Lock Automatic Folding Knife 0591BKS

Model: BU-0591BKS
Manufacturer: Buck
Retail: $250.00
In stock (Usually Ships in 24-48 Hours)
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Note: Automatic Knives may not be shipped outside of the United States. Additionally we cannot ship to the following states: Delaware, Hawaii, Minnesota, New Jersey, New Mexico, New York, Pennsylvania, Virginia, Washington or the District of Columbia.

Blade Length Restrictions may apply to Connecticut and Vermont.


The Buck Paradigm Shift is back by popular demand offering a PRO level knife with the innovative Shift Mechanism bolster lock and safety with high end S35VN stainless steel and G10 handles. Easily opened with a slide of the bolster, the Paradigm offers a stylish and functional everyday carry knife. This automatic version comes with black G10 scales with matching Cerakote coated bolster. Made in the USA and backed by the Buck Forever Warranty.

Brand new, direct from Buck Knives, USA.

Blade: The drop point blade is made from satin finished S35VN with Bos heat treat for excellent daily performance. A high saber grind provides a balance of durability and slicing performance with a pronounced swedge on the spine for enhanced piercing and a fine tip for detail work. A simple slide of the bolster deploys the blade automatically. See below for more details.

Handle: Black stainless steel liners support chamfered G10 scales with matching Cerakote coated bolster that actuates the Shift Mechanism for safe operation. The neutral design with pinched waist at the bolster junction allows for multiple grips while the textured G10 offers solid traction and solid performance. A solid aluminum back spacer and black hardware round out the construction.

Carries via a reversible, tip-up, stainless steel deep carry clip with Graphite Black Cerakote coating.

Shift Mechanism: Push the ridged section of the bolster, the blade will instantly deploy. Then close the bolster
to lock the blade open. Lift the bolster again to unlock and close the blade.

CPM S35VN: was designed to offer improved toughness over CPM S30V. It is also easier to machine and polish than CPM S30V and the adjusted chemistry makes CPM S35VN about 15-20% tougher than CPM S30V without any loss of wear resistance. CPM S35VN’s improved toughness gives it better resistance to edge chipping. Proprietary Bos heat treat offers all around enhanced performance.


Overall Length 7.56"
Blade Length 3.06"
Sharpened Length 3.00"
Blade Thickness 0.12"
Blade Material CPM-S35VN
Blade Type Stainless
Blade Rockwell 59-61 HRC
Lock Shift Mechanism
Safety Yes
Closed Length 5.50"
Handle Thickness 0.57"
Handle Material G10
Bolster(s) Stainless Steel
Liner(s) Stainless Steel
Clip Stainless Steel
Weight 4.83 oz.
Country of Manufacture United States